Sick Quail PLEASE HELP!!!

Today my only pet, a Courtnix Quail, has been acting very strange. She has spent all afternoon, with her feathers, all puffed up, in the corner of her cage with her eyes half-closed and seemingly gasping for air (as shown in the video below). She has not touched her feed bowl, nor has she drank from her bowl at all today. Also, she has lost her sense of balance and will slip and fall as she tries to walk away from me whenever I approach her. Occasionally, she will experience sudden tremors. Every 20 minutes or so, it looks like she attempts to push something out of her rear, but only resulting in green or white poop of a paste consistency.

Her diet everyday consists of laymash and dried mealworms. She is my only quail and is kept in a cage, bedded with grass, outside. It may be worth mentioning that I did feed her a bit of cottage cheese in the morning (before all her symptoms started happening), and I fed her a mushroom from a slice of pizza the night before as well.

Thank you for your response, Binki. I will definitely be keeping her warm inside today. I don't have any access to medicine right now since I live in the city, so I hope it's not an illness; I'm not even sure how to treat her. Hopefully her condition improves in the morning.